I have had good luck finding 91/30's at three local dealers. First one cost $114, the next two went at $169 apiece, after the November elections. They are out there.
I buy them as shooters for me and my family. So far, I've had good luck with the results, and I believe it pays to work with a reputable dealer.
Unless you're buying the Mosin Snipers as a collector, going with a more modern LER Scout scope setup is a much better option. Even the more modest modern scopes work at least as well, and the Scout mounting arrangement permits feeding with strippers, which the original Sniper mount usually won't allow.
Greg